diff options
Diffstat (limited to 'vendor/github.com/containerd/continuity/syscallx/syscall_windows.go')
-rw-r--r-- | vendor/github.com/containerd/continuity/syscallx/syscall_windows.go | 112 |
1 files changed, 0 insertions, 112 deletions
diff --git a/vendor/github.com/containerd/continuity/syscallx/syscall_windows.go b/vendor/github.com/containerd/continuity/syscallx/syscall_windows.go deleted file mode 100644 index 2ba814990..000000000 --- a/vendor/github.com/containerd/continuity/syscallx/syscall_windows.go +++ /dev/null @@ -1,112 +0,0 @@ -/* - Copyright The containerd Authors. - - Licensed under the Apache License, Version 2.0 (the "License"); - you may not use this file except in compliance with the License. - You may obtain a copy of the License at - - http://www.apache.org/licenses/LICENSE-2.0 - - Unless required by applicable law or agreed to in writing, software - distributed under the License is distributed on an "AS IS" BASIS, - WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - See the License for the specific language governing permissions and - limitations under the License. -*/ - -package syscallx - -import ( - "syscall" - "unsafe" -) - -type reparseDataBuffer struct { - ReparseTag uint32 - ReparseDataLength uint16 - Reserved uint16 - - // GenericReparseBuffer - reparseBuffer byte -} - -type mountPointReparseBuffer struct { - SubstituteNameOffset uint16 - SubstituteNameLength uint16 - PrintNameOffset uint16 - PrintNameLength uint16 - PathBuffer [1]uint16 -} - -type symbolicLinkReparseBuffer struct { - SubstituteNameOffset uint16 - SubstituteNameLength uint16 - PrintNameOffset uint16 - PrintNameLength uint16 - Flags uint32 - PathBuffer [1]uint16 -} - -const ( - _IO_REPARSE_TAG_MOUNT_POINT = 0xA0000003 - _SYMLINK_FLAG_RELATIVE = 1 -) - -// Readlink returns the destination of the named symbolic link. -func Readlink(path string, buf []byte) (n int, err error) { - fd, err := syscall.CreateFile(syscall.StringToUTF16Ptr(path), syscall.GENERIC_READ, 0, nil, syscall.OPEN_EXISTING, - syscall.FILE_FLAG_OPEN_REPARSE_POINT|syscall.FILE_FLAG_BACKUP_SEMANTICS, 0) - if err != nil { - return -1, err - } - defer syscall.CloseHandle(fd) - - rdbbuf := make([]byte, syscall.MAXIMUM_REPARSE_DATA_BUFFER_SIZE) - var bytesReturned uint32 - err = syscall.DeviceIoControl(fd, syscall.FSCTL_GET_REPARSE_POINT, nil, 0, &rdbbuf[0], uint32(len(rdbbuf)), &bytesReturned, nil) - if err != nil { - return -1, err - } - - rdb := (*reparseDataBuffer)(unsafe.Pointer(&rdbbuf[0])) - var s string - switch rdb.ReparseTag { - case syscall.IO_REPARSE_TAG_SYMLINK: - data := (*symbolicLinkReparseBuffer)(unsafe.Pointer(&rdb.reparseBuffer)) - p := (*[0xffff]uint16)(unsafe.Pointer(&data.PathBuffer[0])) - s = syscall.UTF16ToString(p[data.SubstituteNameOffset/2 : (data.SubstituteNameOffset+data.SubstituteNameLength)/2]) - if data.Flags&_SYMLINK_FLAG_RELATIVE == 0 { - if len(s) >= 4 && s[:4] == `\??\` { - s = s[4:] - switch { - case len(s) >= 2 && s[1] == ':': // \??\C:\foo\bar - // do nothing - case len(s) >= 4 && s[:4] == `UNC\`: // \??\UNC\foo\bar - s = `\\` + s[4:] - default: - // unexpected; do nothing - } - } else { - // unexpected; do nothing - } - } - case _IO_REPARSE_TAG_MOUNT_POINT: - data := (*mountPointReparseBuffer)(unsafe.Pointer(&rdb.reparseBuffer)) - p := (*[0xffff]uint16)(unsafe.Pointer(&data.PathBuffer[0])) - s = syscall.UTF16ToString(p[data.SubstituteNameOffset/2 : (data.SubstituteNameOffset+data.SubstituteNameLength)/2]) - if len(s) >= 4 && s[:4] == `\??\` { // \??\C:\foo\bar - if len(s) < 48 || s[:11] != `\??\Volume{` { - s = s[4:] - } - } else { - // unexpected; do nothing - } - default: - // the path is not a symlink or junction but another type of reparse - // point - return -1, syscall.ENOENT - } - n = copy(buf, []byte(s)) - - return n, nil -} |